Inspect. To determine the serviceability of an item by comparing its physical, mechanical
and/or electrical characteristics with established standards, through examination (e.g., by
sight, sound or feel).
Overhaul. The maintenance effort (service1 /action) prescribed to restore an item to a
completely serviceable/operational condition as required by maintenance standards in
appropriate technical publications (e.g., depot maintenance work requirement). Overhaul
is normally the highest degree of maintenance performed by the army. (Overhaul does
not normally return an item to a like-new condition).
. Those services/actions necessary for the restoration
of unserviceable equipment
to a like-new condition, in accordance with the original manufacturing standards. Rebuild
is the highest degree of material maintenance applied to army equipment. The rebuild
operation includes the act of returning to zero; those age measurements (e.g.,
hours/miles), considered in classifying Army equipment/components.
Remove/Install. To remove and install the same item when required to perform service1
or other maintenance functions. Install may be the act of replacing, seating or fixing into
position, a spare, repair part or item, in a manner that allows the proper functioning of an
equipment or a system.
Repair. The application of maintenance services, including fault location2/trouble
shooting, removal/installation and disassembly/assembly3, procedures and maintenance
actions4; to identify troubles and restore serviceability to an item, by correcting specific
damage, faults, malfunctions or failures.
Replace. To remove an unserviceable item and install a serviceable counterpart in its
place. The MAC authorizes replacement and the assigned maintenance level is shown as
the reference code in Table 3.
Service. Operations required periodically to keep an item in proper operating condition:
e.g., to clean (including decontaminate), preserve, drain and paint. Service also includes
replenishment of fuel, lubricants, chemical fluids and gases.
Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic or
electrical characteristics of an item and comparing those characteristics with prescribed
standards. The Test function is also used in the location of faults.
Maintenance Allocation Chart (MAC)
The MAC, in Table B 1, designates overall authority and responsibility for the performance
of maintenance functions on the identified items. The MAC is divided into six columns
and the function of each column is explained as follows:
Column (1) Group No. The purpose of the Group No. is to identify maintenance-
significant items with their next higher assembly.
Column (2) Component/Assembly. Column (2) contains the names of items for which
maintenance is authorized.
Services. - Inspect, test, service, adjust, align, calibrate and/or replace.
Fault location/troubleshooting. - The process of investigating and detecting the cause of equipment malfunctioning: the act of
isolating a fault within a system or item under test.
Disassembly/assembly. - The step-by-step breakdown (taking apart) of a spare/functional group-coded item, to the level of its
least component that is identified as maintenance significant, (i.e. assigned a reference code in Table 1).
Actions. - Welding, grinding, riveting, straightening, facing, machining and/or resurfacing.